i have 4 chicks, 3 are 5 weeks old and one is 2 weeks old.. there is blood in one of their poop.. i know i'm kind of freaking out but is this normal? is it a disease? what do i do? please help.. they have all been eating normally and drinking plenty of water. they are all behaving normally and none of them look sick in any way.. they began free ranging about 2 days ago.. i hope this info helps..